US 7,257,498 B2 · System and method for the safe automatic detection of a field device communicating with current modulated signal

Abstract

A current generator that provides a first current level to read a configuration parameter of a field device. The current generator also provides a second current level. The first current level is lower in amperage than the second current level. The first current level does not operate the field device. The second current level operates the field device. A current sensor is connected in circuit with the field device. The current sensor reads the configuration parameter associated with the first current level. A method is provided that creates a current that reads a configuration parameter. The current has less than a minimum amplitude to operate necessary to operate a field device. The configuration parameter is read from the field device through employment of the current. The field device is configured through employment of the configuration parameter.

Claims20

Dependent claims

A system comprising:

a current generator that provides a first current level to read a configuration parameter of at least one field device, wherein said first current level is lower in amperage than a second current level and wherein said first current level does not operate said field device;
said current generator also provides said second current, wherein said second current level operates said field device;
and
a current sensor connected in circuit with said field device wherein said current sensor detects said configuration parameter(s) associated with said first current level.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

11/000,576Filed 30 Nov 2004 · us provisional application

Priority

4 Dec 2003

Published

US 2005/0125173 A19 Jun 2005

Granted

14 Aug 2007

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

G05B 19/042
Program control other than numerical control, i.e. in sequence controllers or logic controllers: using digital processors
G05B 2219/21128
Pc I-O input output: change control signal, first max or min signal, then normal desired signal
G05B 2219/25094
Pc structure of the system: at start, I-O modules receive functionality and check with its own functionality
G05B 2219/25191
Pc structure of the system: current loop

System and method for the safe automatic detection of a field device communicating with current modulated signal

Life of this patent

System and method for the safe automatic detection of a field device communicating with current modulated signal

Life of this patent

Abstract

Claims20